Vacuum-jet pumping system.



I lgwwm WITNESSES.-

T. L. DAVENPORT.

VACUUM lET PUMPING SYSTEM. APPLICATION FILED APR.8,19Hv

. PilfiVIltLdAllg. 31, 1915.

7760/7706 L. flaw/ m) THQIIEAS Ii. DAVENPORT, @In" EVERETT, VJASHINtil-TQN.

VACUUM-JET PUMPING SYSTEM.

Specification of Letters ratent.

'Fatented Aug" 3t, fillilo'v Application sled April 3. 191a,, Serial No. 830,336.

b all whom it may concern Be it known that l, 'fnoMAs L. DAVEN- ronr, citizen of theUnited States, residing Everett, in the county of Snohoinish and State or Washington, have invented a cer tain new and useful llmprovement in Vacuet Pumping .Systems, of which the following is a specification.

My invention relates to improvements in vacuum-jet pumping systems and the obect of my improvement; is to provide a system of conduits with which is associated a plurality of vacuum-jet pumps valves that shall be adapted for use in a building in the work or remo the dirt and dust from the rooms of building to a desired place of disposal and that shall be adapted beoperated displace and re move any obstruction that may get accidentally lodged within it and that shall be further adapted in its operation to create a greater power of suction than is developed.

in systems heretofore employed whereby conduits of a given crosssectional area shall have greater capacity. 1 accomplish this object by devices illustrated in the accompanying drawing which is a view in long tudinal section of a structure embodying my invention certain portions being shown in side elevation.

Referring to the drawing, in which, like reference numerals indicate like. parts, 1 is a vacuum-jet and 2"is a similarly constructed larger vacuum-jet each of such jets being formed of an outer cylindrical casing 3 the upper end portion of which is exteriorly threaded and is provided with an interiorly disposed annular ridge 4 and the lower portion of which is formed to have converging side walls 5 of the shape of an inverted frustum of a cone and to terminate in an exteriorly threaded cylindrical portion 6 which is slightly larger in internal diameter than the lower end portion of the converging portion 5. lt will be observed that by reason of this construction there is formed between the portions 1 and 6 a sharp edged shoulder, the outlet side of the shoulder being at right angles to the axis of the structure.

A tube 7, provided with an exteriorly disposed annular flange 8' at its top end and with beveled edges 9 at its lower end, is concentrically disposed within the casing 3 to rest upon annular washers 18 that restupon the ridge 4 and the whole being se-- curely held in position by an annular clamp 10 that is mrewed onto the casing 3, the washers 18 serving to provide means for adjusting the member I longitudinally within the casing 53, as for instance, it it be desired to lower the tube '2' in the casing 3 then the clamp 10 may be removed and the tube 7 lifted out of the casing 3, and any required number of the washers 18- taken out whereupon the tube 7 may be replaced and the washers 18 that were talren out may then be replaced on the top of the flange 8, as shown in the lower jet 2, and the clamp 10 again placed on the casing 3 and screwed down on the washers 18 to hold the tube '1 in position. i

The clamp 10 of the upper jet 1 is adapted to have a pipe 11 connected therewith, as clearly shown, which pipe 11 and branches that may be connected therewith may lead to any desired points as to various rooms of a building wherein vacuum cleaners are to be operated.

The larger lower jet 2 is connected with the upper jet 1 by a nipple 12, the wall of the casings 3 and 3 of such jets each being provided at a point above its converging.

portion 5 with a threaded hole in which a pipe, as pipes 13 and 14 is screwed such pipes 13 and ll being connected with a larger pipe 15 that is adapted to be connected with a source of supply of fluid under pressure, as steam, whereby such steam may be emitted from the pipes 13 and 14: into the spaces surrounding the tubes 7, 7 where such steam may be directed downwardly to issue at a high velocity from the small annular passageways between the beveled lower ends 9 of the tubes 7 and 7 and the adjacent walls of the converging portions 5 of the casings 3 and 3 thus creating a suction in the tubes 7 and 7 and the pipe 11 and the pipes that may be connected therewith.

The steam from the pipes 13 and 14 and the air, dust, and dirt that may be drawn in through the pipe 11 are delivered into a pipe 16 that connects with the discharge end of the larger jet 2 through which such air and dust may be 'conductedto a suitable point where they may be discharged, as, for instance, into the fire of a furnace where they help to feed combustion. The pipe 16 is provided with a gate valve 17 which may be closed, as shown in the accompanying drawing, to cause steam to flow with a high velocity upwardly through the pipe 11 to blow out obstructions from such pipe 11 in case it should become clogged by refuse matter, such valve being particularly advantageous in cases where my device is connected with vacuum sweeping and cleaning apparatus.

I have found by experiment that where two vacuum-jets of the same size are connected in a manner similar to the manner illustrated in the accompanying drawing their combined efliciency will not be considerably greater than the efliciency of a single one of such jets but where a smaller and a larger vacuum-jet are connected, as shown, the efliciency of the two jets will be much greater than double the efliciency of either of such jets when taken singly. It is also to be noted that by reason of the sharp edged shoulder at the outlet of the converging side walls 5, a vena contracta effect is produced which greatly increases the longitudinal velocity of the stream and thereby the efficiency of the apparatus." The steam from the larger jet 2 issuing at a high velocity from the annular passage: way around the lower end of the larger tube 7 creates a suction in such larger tube 7 and consequently creates an additional suction in the tube 7 of the smaller jet 1 and the pipe 11 and an increase in the downward velocity of the air and steam in such tube 7 and pipe 11.

If desired, more than two jets of gradually increasing sizes may be connected in a manner similar to the manner shown, but for the purpose of this description I have illustrated and considered only two of such jets.

Obviously changes 1n the form of construction of the vacuum-jets embodied in my device may be made without departing from the substantial arrangement herein shown and described or sacrificing any of the advantages of my invention.

What I claim is:

In a structure of the class described, a plurality of vacuum jets in axial alinement and of gradually increasing size, each jet embodying a circular casing with an 1nverted frusto=conical bottom continuing in a shortcylindrical section, said cylindrical section being of greater diameter than the minor base of the-frusto cone whereby to form a sharp edged shoulder, an inwardlydirected annular. ridge carried by the casing adjacent theupper end thereof, said casing being threaded exteriorly at the upper end thereof, a tubular section having an outwardly-directed annular flange to be seated on said casing, ridge, the lower end of said tube being beveledand parallel with the casing bottom, a screw clamp for securing the casing and tube together, embodying a fiat disk-like portion and an internally threaded depending flange to be threaded on the upper end of the casing, with the disk-like portion thereof binding the flange on the tubular member, an internally threaded boss on the upper end of the clamp, a threaded nipple connection between the lower cylindrical section of each casing and adjacent clamp, a valve-controlled outlet pipe connected to the bottom et, and fluid pressure pipes communicating with each casing intermediate the ends thereof and exterior-1y of the tubes.

In Witness whereof, I hereunto subscribe my name this 28th day of. March A. D., 1914.

THOMAS DAVENPORT. 

